A small followup to this case.
Looks like mp2 or apache2 are killing background process, by PID; Probably in a cleanup handler for the request. I had to add additional "return if fork()0;" to the exec_helper.pl script to make bg processes survice.
what do you mean by background proc?
so you do an additional fork? where do you return() to? it's probably exit(), no? show us the whole code snippet?
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